Acetic Acid → HCID 15838382, compound

Participants

Reaction Steps

To a solution of 1-cyclopentyl-6-(4-pyridyl)-pyrazolo(3,4-d)pyrimidin-4-amine (3.0 g, 0.011 mole) in water 60 ml) at room temperature was added bromine (1.8 g, 0.011 mol). The reaction mixture was stirred at room temperature for 1 hour, then was heated on a steam bath for 2 hours. The solvent was removed in vacuo and the residue was suspended in water. Ammonium hydroxide was added followed by acetic acid until a pH of 4-5 was obtained. A solid was collected by filtration and washed with water. Water (60 ml) and bromine (0.3 ml, 0.006 mol) were added to the solid residue and the mixture was heated on a steam bath for 1 hour. The mixture was poured into ice-water and ammonium hydroxide, then acetic acid was added. A solid was collected by filtration, dissolved in ethyl acetate, dried over MgSO4 and concentrated in vacuo to afford 2.2 g (56%) of 1-cyclopentyl-3-bromo-6-(4-pyridyl)-pyrazolo[3,4-d]pyrimidin-4-amine, m.p. 189°-191° C.

Provenance & Evidence